Triple-shell water-tube boiler



May 15, 1928.

1,669,610 G. GARTLING TRIPLE SHELL WATER TUBE BOILER Filed July 20, 1921 Z-Sheets-Sheet l 7 eolye fa /19 May 15, 1928. 1,669,610

G. GARTLING TRIPLE SHELL WATER TUBE BOILER Filed Jul 20. 1921 2 Sheets-Shes. 2

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UNITED STATES GEORGE GARTLING, ,OF LOS ANGELES, CALIFORNIA.

TRIPLE-SHELL WATER-TUBE BOILER.

Application filed July 20,

An object of this invention is to provide a steam generator having a large heating surface in a compact form and which can be easily constructed and easily cleaned, and is applicable to steam generating, water heating and analogous uses.

An object is to so construct the boiler that both ends of the water tubes are inside the generator.

Another object is to make provision whereby the heat is applied more directly to the cold water that enters the boiler and in which the products of combustion part with their heat in the most effective manner to generate the steam and whereby good circulation is maintained.

Another object is to provide a boiler in which there is ample space for super-heating steam without danger of burning out the tubes.

.Other objects are so construct the boiler as to preserve the joints from the destruca nd the outer ends of the tubes of the boiler whenever it is desired to clean the boiler;

A feature of the invention is the provision of a central upright shell having a bottom that is removable so that access to the inner ends of the tubes may be easily gained.

The invention includes the boiler and various features thereof.

Another feature of invention is the provision of inwardly tapering radiating water tubes that are arranged in series so that the area between the inner-most shell and the intermediate shell may be well filled with staggered tubes that deflect the heat upwardly from tube to tube; and also present a large water heating surface to the furnace fire.

Other objects, advantages and features of invention may appear from the accompany ing drawing, the subjoined detail description and the appended claims.

The accompanying drawings illustrate the invention; v v v Figure 1 vertical. axial section of 1921. Serial No. 486,164.

water tube boiler constructed in accordance with this invention.

Fig. 2 is a horizontal section of the same on line 00 w Fig. 1.

Fig. 3 is a diagrammatic fragniental partly developed elevation ofthe intermediate practical way within the known art; and' illustration in this respect is unnecessary.

1 is the inner shell surrounded by the intermediate shell 2 which in turn is surrounded by the outer shell 3; all of the shells being concentric and spaced apart according to the purpose and judgment of the constructor. The shells are mounted on a suitable support as the masonry 4; the inner and intermediate shells 1, 2, being provided with outwardly extending bottom flanges 5 and 6 that rest upon the support at lower and higher levels respectively to provide heating space or fire box a. The bottom of the inner shell 1 is closed by a'base plate 7 fixed to the under side of flange 5 by bolts 8.

The outer shell 3 is provided at its lower end with an outwardly extending flange 9 resting upon the outwardly extending lower flange 6 of the intermediate shell 2, and is fixed thereto by the bolts 10. A fire box housing 11' may be provided with an outwardly extending flange 12 at its top secured to the flanges 6 and 9 by'said bolts 10. The top of the outer shell 3 is provided with an inwardly extending flange 13 and the top of the intermediate shell is provided with an outwardly extending flange 14 upon which the flange 13 rests and to which it is secured by suitable means as stud bolts 15. The outer shell is provided. with lugs 16 by which it may be raised when the bolts 10 and 15 are loosened.

The inner shell 1 is provided'with a steam dome 17 secured thereto by a suitable joint 18; the open end of said dome being preferably inserted into the inner shell and secured by suitable means as by welding or by riveting; or in some cases the eiitire inner shell and dome be from one higher temperature.

piece. Only the riveted form is shown as suggestive to the construction of other well known joints.

The annular space between the inner shell 1 and the intermediate shell 2 is traversed by inwardly tapering horizontal radiating tubes 19, the ends of which are expanded into said inner and intermediate shells respectively so that such shells are fixed together by said tubes. A water glass 20 may be appliedat any position deemed advisable and is shown in Fig. 1 as located below the top series 19 of the radiating tubes. Inthe form of boiler illustrated a highly heated steam dome isprovided above the water level 21 for raising the steam to a The steam dome 17 is siu'rounded by a housing 22' which is fixed to the outwardly extending flange 14 of the intermediate shell; and said housing is of less diameter than the orifice within th'eannular flange 13 v at the upper end ofthe outer shell 3.

The the box 23 is surrounded by the fire wallQ l inside the fire box housing 11 and the draft from: the fire box is up through the heat space 25 between the inner and 1ntermediateshells, and the exhaust escapes into thespace-26 between the dome 17 and the exhaust housing 22, The passage throu h said heatspace is tortuous by rea- Son 0 a zig zag arrangement of the tubes 19 and 19" so that as the. heated products of combustion pass upward they are deflected from tube to tube, thus parting with their caloric andheating the contents of the tubes and shells. a p

The feed water and steam pipes 27, 28 are shown passing through the top of the steam dome, the :feed water pipe 27 extending down, and discharging practically at alzlout the water level.

A clear way outside of the dome housing 22 is provided sufficiently high above the flange 14: to allow the outer shell 3 to be raised as may be desired until its lower flange 9 is above the level of the outer ends of the uppermost series 19" of the tubes, thus giving access to the intermediate shelland the tubes.

-29 is a tunnelleading from the outside to .the space underneath the inner shell so that when it is desired to removethe base or bottom 7 this may be done with ease-andconveni nce,

- Fire may be applied to the fire box 23 in any desired way as by firing. solid, liquid 7 or gaseous fuel; the appliances for which are Wellknown and are not illustrated in the drawings. p

In practical use the liquid to be: heated willbe contained in the inner shell, in the space between the intermediate shell and the outer shell, and inthe connecting tubes which are belowithe water level. If, as is suginwardlyextending gcsted in the drawings, the water is not allowed to cover the uppermost tubes, the heat absorbing capacity of the tubes that are subreadilysettle to the bottom of the inner shell to absorb the heat from the fire in the (fire box; and the slope of the upper sidesof the water tubes 19 is upward from theinner shell so that circulation from the inner shell to the outer shell is facilitated. and circulation back to the inner shell is retarded, and

so that the steam seeks the steam space above the water level between the outer and intermediate shells and then seeks the innershell and steam dome, through the upper tubes Thesafety Valve 30 is connected by pipe 31 with the steam dome audit is understood that the water and steam pipes '27, 28; are

provided with the usual valves not shown for control and cut oil of the feed water and thesteam.

l. The combination with a suitable support provided with a fire box, of an outer,

inner and intermediate concentric shell supported by said support, the inner and inter mediate shells being'provided with outwardly extend ng flanges that rest upon the sup port at lower and higher levels respectively,

there being a lieatingspace or fire box around the inner shell; a base plate fixed to the undersideof theoutwardly extending flange of the inner shell, and the outer shell being provided at its lower end with an outwardly extending flange resting on the outwardly extending flange of the intermediate shell ill) and detachably fixed thereto by bolts, said outer shell being an inwardly exten ing flange and the intermediate shell being provided at its top with an outwardly extending flange resting thereon, and means detachably connecting said flanges together. j 7 p i 2. Thecombination'with an intermediate shell having outwardly projecting flanges at bottom and top, the top flange being of less diameter than the bottom flange; of an outer shell provided at its bottom .with an outwardly extending flan e and atiits top with an ange; means detachrovided atits top with ably connecting said outwardly extending flange to the; bottom flange; means detachably GODDBCtIIIg said inwardly extending ran flange to the top flange of the intermediate shell said parts being so arrangedthat the flanges of said outer and intermediate shells can be disconnected to raise said outer shell to expose said intermediate shell; an inner shell spaced apart from the intermediate shell, and tubes extending across the space between said intermediateshell and the inner shell and opening respectively into the inner shell and into the space between the intermediate and outer shells.

3. In a boiler the combination of inner, intermediate and outer shells, spaced apart, the inner shell being closed at its ends, and extending beyond the outer shell; tubes extending across the space between the inner and intermediate shells and opening through said shells; the outer shell being telescopic relative to the intermediate shell and the intermediate shell being provided with outwardly extending flanges to which the outer shell is detachably fixed; means forming a housing for the projecting end of the inner shell and forming an exhaust passage for the space traversed by said tubes; the outershell being adapted-t0 be moved from-its connection with the intermediate shell, and the housing being of less diameter than the outer shell so as to allow the outer shell to be with drawn from the intermediate shell.

'4. In a boiler ofthe character set forth having inner, intermediate and outer shells spaced apart and tubes connecting the inner and intermediate shells; a steam dome constituting a portion of the inner shell; and a housing fixed to the intermediate shell and surrounding said steam dome; the outer shell being detachably connected to the intermediate shell and adapted to be moved from the position surrounding the intermediate shell, into a position surrounding the housing, for convenience of tube cleaning.

In testimony whereof, I have hereunto set my hand at. Los Angeles, California, this 15th day of July, 1921. v

GEORGE GARTLINGs 

